Designed for the wider neck and flat fingerboards of nylon string classical guitars. Lighter clamping action is ideal for classical strings. Made of strong, lightweight aluminum. The spring-tensioned Quick-Change mechanism clamps firmly to hold intonation, yet is quickly and easily released and repositioned without disturbing the tuning. You can operate it comfortably with one hand. Doesn't interfere with fingering and the pads won't mar or react with guitar finishes.